| 大亚湾马尾藻细胞中Cu、Pb、As的生物地球化学特征与环境意义 |
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| 引用本文： | 苗莉,颜文,钟立峰,徐维海,颜彬.大亚湾马尾藻细胞中Cu、Pb、As的生物地球化学特征与环境意义[J].地球科学,2012,37(1):139-144. |
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| 作者姓名： | 苗莉 颜文 钟立峰 徐维海 颜彬 |
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| 作者单位： | 中国科学院南海海洋研究所, 中国科学院边缘海地质重点实验室, 广东广州 510301 |
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| 基金项目： | 中国科学院、国家外国专家局创新团队国际合作伙伴计划KZCX2-YW-T001国家自然科学青年基金41106104国家自然科学青年基金40802087广东省"908"成果集成项目GD908-JC-07中科院南海海洋研究所青年人才领域前沿项目SQ200807 |
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| 摘 要： | 为了全面理解大亚湾海域环境典型重金属污染水平以及潜在的生态危害, 以海水-沉积物-马尾藻为系统研究对象, 分析重金属污染元素Cu、Pb、As在大亚湾表层沉积物、海水、马尾藻以及细胞超微结构中的地球化学和生物地球化学特征, 结果表明, 沉积物和海水中Cu、Pb、As的平均含量均未超过国家一类质量标准, 部分站位因外源输入含量较高.生物富集系数表明, 马尾藻对重金属吸收大小顺序为As＞Pb＞Cu, 且表现出对砷较强的富集吸收能力.透射电子显微镜下, 大亚湾重金属元素生物地球化学效应主要表现为马尾藻细胞超微结构异常和变形, 并出现大量黑色电子致高密度体.能谱分析表明, Cu、Pb、As等重金属元素以电子致高密度体的形式淀积在马尾藻细胞的内部组织结构中, 对细胞超微结构有损伤诱变作用, 为大亚湾生态环境提供早期预警信号.
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| 关 键 词： | 生物地球化学 重金属 马尾藻 大亚湾 |
| 收稿时间： | 2010-12-21 |
Biogeochemical Characteristics and Its Environmental Significance of Heavy Metals in the Sargassum Cells in Daya Bay,China |
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| Abstract: | In order to make a comprehensive analysis of the heavy metals pollution and potential ecological risk in Daya bay, China, this paper focuses on seawater-sediment-Sargassum system as research object and analyzes the geochemical and biogeochemical characteristics for Cu, Pb and As in the seawater, surface sediment, Sargassum and cells of Sargassum. The results show that the concentrations of Cu, Pb and As are lower than the values of grade Ⅰ national standards for sediment, but some are of high-value in some sampling sites because of the source of input. The biological absorption coefficients indicate that the accumulation ability of heavy metals for Sargassum is arranged from high to low, as follows: As > Pb > Cu and Sargassum exhibits high abilities of accumulation of As. The study of the ultrastructure using transmission electron microscope reveals that the cell structures of Sargassum are anomalous and aberrant and there are lots of relatively high electron-density substances diffuse in the cells. The energy-dispersive spectroscopy (EDS) analysis shows that Cu, Pb and As in the form of comparatively high electron-density substance diffuse in the cell structures induce irreversible damage to the cell. The results provide the forepart warning information for ecological environment of Daya bay. |
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